Solved! In my HP ProBook, LEFT KEY and DOWN KEY are NOT working but RIGHT KEY and UP KEY are working. Please help me to resolve the is

[d_babaria]

Right side key & UP key are working but Left key & Down key do not respond at all !

 

[webworkings]

Try checking it for dust, dirt, debris. The keys may just be blocked. If that resolves nothing, then try this...

1. Uninstall the keyboard driver.
2. Reboot the computer (without reinstalling the driver).
3. When it restarts, it should reinstall the driver on its own.

If this doesn't work, you may wish to try connecting/reconnecting an external keyboard and see if it works fine. If it does, then it could be the keys themselves that are the issue.

Additionally, if your device uses one, you may want to try updating the Synaptics Driver if the above doesn't help.

You may also want to check the device for malware, viruses, etc., which can interfere with normal operation.